Tone modifiers for phonographs



July 29 1924;.

E. C. CLARK ET AL TONE MODIFIER FOR PHONOGRAPHS- Filed Nov. 20, 1922 y means represented by the thumb screw 22 is no limitation upon any other mechanical means for maintaining the stylus 21 in its 0perative relation to the arm 20.

Within the socket member 18 a vdisk 23 is employed upon which the head 17 rests. The spindle itself is surrounded by a cushion 24 with an annulus 25 above said cushion provided with a boss 26 extending upwardly through an opening 27'in the sleeve 19.

In the type shown at Figure 3 all the parts are identical except that the socket member 18 is internally threaded and the compression member 19 is externally screwthreaded.

It will be apparent from either Figures 2 or 3 that the spindle 16, including its head 17 is Wholly surrounded within the member by a cushioning material. This cushioning material, as at present practised, is rubber, but it is to be understood that the invention isin no way limited to the employment of rubber for the purpose vand that any other cushioning material found desirable or efficient for the purpose is fully within the scope of the invention.

In operation the device is assembled as shown either at Figures 2 or 3 according to the type employed, the spindle 16 being inserted into the stylus bar in the manner usually employed in inserting and securing a stylus and will there remain. The stylus 21 may be changed as often as the exigencies of use may make desirable.

It is also apparent that by exerting greater or less pressure upon the cushioning mem- Ibers by the manipulation of the threaded connection between the two parts 18 and 19 or 18 and 19', the elasticity of connection will be varied,lthereby varying the vibration transmission of the device from the stylus to the stylus bar.

It will also be obvious that while the cushioning ofthe spindle hasbeen shown as composed of several parts separately united and connected that these parts may be varied as to their relative sizes -or shapes and that the employment of three separate elements for the purpose is the present practice,

probably not essentialf to the invention and that any manner of completely cushioning the spindle 16 relative to the stylus-carrying metallic parts is comprehended withln the present invention whether said cushioning be in a lesser or greater number of parts or, formed as a single cushion with the head 17 of the spindle embedded, such features being merely mechanical carrying forward of the present invention and to be dictated by circumstances and contingencies of manufacture and marketing demand.

Also the specific type of socket-members and other mechanical features while represented in the drawing in a form at present seeming desirable, are obviously capable of variation -within the lscope of the present invention.

What we claim is:

1. A tone modiiier for phonographs comprising a hollow member, a spindle having one end inserted into the hollow member, cushioning material embracing said inserted end and maintaining it out of metallic contact with said hollow member, said hollow member being also provided with a stylusreceiving socket in alinement with said spindle.

2. A tone -modifier for phonographs comprising a socket member embodying a stylus socket and a chamber illed with compressible ,cushioning material, a spindle extending into the chamber and embedded in the cushioning material, and a closure for the chamber adapted to exert varying degrees of compression on the cushioning material.

3. A tone modifier for phonographs, comprising a socket member embodying a Vstylus socket and a chamber filled with compressible cushioning material, a spindle extending into the chamber and having a head embedded in cushioning material, and a closure for the chamber adapted to exert varying degrees of compressionon the cushioning material.

In testimony whereof we hereunto aiix our signatures. i

EDWIN COULSON CLARK. ARTHUR T. BROWER. 

